1
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Remarkable anticancer activity and molecular docking studies of ferrocene tethered pyrimidobenzothiazoles and pyrimidobenzimidazoles. RESULTS IN CHEMISTRY 2022. [DOI: 10.1016/j.rechem.2022.100758] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
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2
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Borys AM, Clark ER, Saines PJ, Alberola A, Rawson JM. A short, versatile route towards benzothiadiazinyl radicals. Chem Sci 2021; 13:149-158. [PMID: 35059163 PMCID: PMC8694340 DOI: 10.1039/d1sc04248c] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2021] [Accepted: 11/23/2021] [Indexed: 11/26/2022] Open
Abstract
A family of substituted 1,2,4-benzothiadiazine 1-chlorides have been prepared by treatment of N-arylamidines in neat thionyl chloride at reflux. The S(iv) 1-chlorides are readily reduced under mild conditions to persistent 1,2,4-benzothiadiazinyl radicals which have been characterised by EPR spectroscopy and cyclic voltammetry. Crystallographic studies on isolated radicals indicate that the radicals dimerise via pancake bonding in the solid-state, resulting in spin-pairing and net diamagnetism. A family of 1,2,4-benzothiadiazinyl radicals are accessible from 1,2,4-benzothiadiazine 1-chlorides which can be prepared in a single step by treatment of N-arylamidines in neat thionyl chloride at reflux.![]()
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Affiliation(s)
- Andryj M Borys
- School of Physical Sciences, University of Kent Ingram Building Canterbury Kent CT2 7NH UK
| | - Ewan R Clark
- School of Physical Sciences, University of Kent Ingram Building Canterbury Kent CT2 7NH UK
| | - Paul J Saines
- School of Physical Sciences, University of Kent Ingram Building Canterbury Kent CT2 7NH UK
| | | | - Jeremy M Rawson
- Department of Chemistry and Biochemistry, The University of Windsor 401 Sunset Ave. Windsor ON N9B 3P4 Canada
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3
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Al‐Zoubi RM, Al‐Jammal WK, Al‐Zoubi MS, Ferguson MJ, Zarour A, Yassin A, Al‐Ansari A. Palladium‐Catalyzed Regioselective Coupling of Amidines and 1,2,3‐Triiodobenzenes: Facile Synthesis of 2,3‐Diiodinated
N
‐Arylbenzimidamides as Potential MDM
2
and MDM
4
Inhibitors. ChemistrySelect 2021. [DOI: 10.1002/slct.202100671] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Raed M. Al‐Zoubi
- Department of Chemistry Jordan University of Science and Technology P.O.Box 3030 Irbid, 22110 Jordan
- Surgical Research Section Department of Surgery Hamad Medical Corporation Doha Qatar
| | - Walid K. Al‐Jammal
- Department of Chemistry Jordan University of Science and Technology P.O.Box 3030 Irbid, 22110 Jordan
| | - Mazhar S. Al‐Zoubi
- Department of Basic Medical Sciences Faculty of Medicine Yarmouk University Irbid Jordan
| | - Michael J. Ferguson
- Department of Chemistry Gunning-Lemieux Chemistry Centre University of Alberta Edmonton Alberta T6G2G2 Canada
| | - Ahmad Zarour
- Surgical Research Section Department of Surgery Hamad Medical Corporation Doha Qatar
| | - Aksam Yassin
- Surgical Research Section Department of Surgery Hamad Medical Corporation Doha Qatar
| | - Abdulla Al‐Ansari
- Surgical Research Section Department of Surgery Hamad Medical Corporation Doha Qatar
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4
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Banerjee I, Sagar S, Panda TK. Calcium mediated efficient synthesis of N-arylamidines from organic nitriles and amines. Org Biomol Chem 2020; 18:4231-4237. [PMID: 32458962 DOI: 10.1039/d0ob00805b] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Amidines are a preeminent group of organic compounds having wide applications in various industries. Here, we have developed a simple one-step reaction protocol for the facile synthesis of N-arylamidines catalysed by calcium bis(hexamethyldisilazide) [Ca{N(SiMe3)2}2(THF)2]. The amidine synthesis was readily achieved from organic nitriles and amines which provided a broad substrate scope ranging from electron-withdrawing to electron-donating substitutions as well as heterocyclic substitution. The reaction was carried out in a solvent-free medium under ambient conditions. The nucleophilic addition of aromatic amines to aryl nitriles led to good to excellent yields of the corresponding amidines. The reactivity of the amidines was further examined and the respective urea derivatives were achieved in excellent yields. The plausible mechanism involves the generation of an active calcium amido pre-catalyst that helps in the activation of nitriles in the reaction course.
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Affiliation(s)
- Indrani Banerjee
- Department of Chemistry, Indian Institute of Technology Hyderabad, Kandi, Sangareddy 502285, Telangana, India.
| | - Shweta Sagar
- Department of Chemistry, Indian Institute of Technology Hyderabad, Kandi, Sangareddy 502285, Telangana, India.
| | - Tarun K Panda
- Department of Chemistry, Indian Institute of Technology Hyderabad, Kandi, Sangareddy 502285, Telangana, India.
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5
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Aly AA, El-Shaieb KM. Facile Synthesis of 4-phenyl-6-[(Z)phenylimino]-3,6-dihydro-1,3,5-thiadiazine-2,2-dicarbonitriles. JOURNAL OF CHEMICAL RESEARCH 2019. [DOI: 10.3184/030823407x207086] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
N-Imidoylthioureas 2a–e reacted with 1,1,2,2-tetracyanoethylene (1) to form the thiadiazines 3a–e. In the case of 1e, tricyanovinylation of a phenyl substituent accompanied formation of the thiadiazine ring.
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Affiliation(s)
- Ashraf A. Aly
- Chemistry Department, Faculty of Science, El-Minia University, 61519-El-Minia, A. R. Egypt
| | - Kamal M. El-Shaieb
- Chemistry Department, Faculty of Science, El-Minia University, 61519-El-Minia, A. R. Egypt
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6
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Teders M, Gómez‐Suárez A, Pitzer L, Hopkinson MN, Glorius F. Durch sichtbares Licht vermittelte Funktionalisierungen von Benzotriazolen, inspiriert durch mechanismusbasiertes Lumineszenz‐ Screening. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201609393] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Michael Teders
- Organisch-Chemisches Institut Westfälische Wilhelms-Universität Münster Corrensstraße 40 48149 Münster Deutschland
| | - Adrián Gómez‐Suárez
- Organisch-Chemisches Institut Westfälische Wilhelms-Universität Münster Corrensstraße 40 48149 Münster Deutschland
| | - Lena Pitzer
- Organisch-Chemisches Institut Westfälische Wilhelms-Universität Münster Corrensstraße 40 48149 Münster Deutschland
| | - Matthew N. Hopkinson
- Institut für Chemie und Biochemie Freie Universität Berlin Takustraße 3 14195 Berlin Deutschland
| | - Frank Glorius
- Organisch-Chemisches Institut Westfälische Wilhelms-Universität Münster Corrensstraße 40 48149 Münster Deutschland
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7
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Teders M, Gómez‐Suárez A, Pitzer L, Hopkinson MN, Glorius F. Diverse Visible‐Light‐Promoted Functionalizations of Benzotriazoles Inspired by Mechanism‐Based Luminescence Screening. Angew Chem Int Ed Engl 2016; 56:902-906. [DOI: 10.1002/anie.201609393] [Citation(s) in RCA: 65] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2016] [Indexed: 11/06/2022]
Affiliation(s)
- Michael Teders
- Organisch-Chemisches Institut Westfälische Wilhelms-Universität Münster Corrensstrasse 40 48149 Münster Germany
| | - Adrián Gómez‐Suárez
- Organisch-Chemisches Institut Westfälische Wilhelms-Universität Münster Corrensstrasse 40 48149 Münster Germany
| | - Lena Pitzer
- Organisch-Chemisches Institut Westfälische Wilhelms-Universität Münster Corrensstrasse 40 48149 Münster Germany
| | - Matthew N. Hopkinson
- Institut für Chemie und Biochemie Freie Universität Berlin Takustrasse 3 14195 Berlin Germany
| | - Frank Glorius
- Organisch-Chemisches Institut Westfälische Wilhelms-Universität Münster Corrensstrasse 40 48149 Münster Germany
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8
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Veer SD, Katkar KV, Akamanchi KG. Sulfated tungstate catalyzed activation of nitriles: addition of amines to nitriles for synthesis of amidines. Tetrahedron Lett 2016. [DOI: 10.1016/j.tetlet.2016.07.073] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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9
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Clark ER, Anwar MU, Leontowicz BJ, Beldjoudi Y, Hayward JJ, Chan WTK, Gavey EL, Pilkington M, Zysman-Colman E, Rawson JM. Synthesis and characterisation of first row transition metal complexes of functionalized 1,2,4-benzothiadiazines. Dalton Trans 2014; 43:12996-3005. [DOI: 10.1039/c4dt01413h] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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10
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Clark ER, Hayward JJ, Leontowicz BJ, Eisler DJ, Rawson JM. Syntheses of, and structural studies on, benzo-fused 1,2,4-thiadiazines. CrystEngComm 2014. [DOI: 10.1039/c3ce42205d] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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11
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Remarkable anti-breast cancer activity of ferrocene tagged multi-functionalized 1,4-dihydropyrimidines. Eur J Med Chem 2013; 65:232-9. [DOI: 10.1016/j.ejmech.2013.04.021] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2013] [Revised: 03/29/2013] [Accepted: 04/08/2013] [Indexed: 11/22/2022]
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12
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Patil UD, Mahulikar PP. A Convenient, TiCl 4 /SnCl 4 -Mediated Synthesis of N-Phenyl or N-Aryl Benzamidines and N-Phenylpicolinamidines. ISRN ORGANIC CHEMISTRY 2012; 2012:963195. [PMID: 24052858 PMCID: PMC3767339 DOI: 10.5402/2012/963195] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/24/2012] [Accepted: 06/19/2012] [Indexed: 11/23/2022]
Abstract
A new, TiCl4-or SnCl4-mediated, solvent-free method was developed for the synthesis of N-Aryl benzamidines and N-phenylpicolinamidines, in moderate-to-good yield, using suitable amines and nitriles as starting materials.
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Affiliation(s)
- Umesh D Patil
- School of Chemical Sciences, North Maharashtra University, Jalgaon 425 001, India
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13
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Synthesis and characterization of an unsymmetrical cobalt(III) active site analogue of nitrile hydratase. J Biol Inorg Chem 2011; 16:937-47. [PMID: 21638158 DOI: 10.1007/s00775-011-0794-7] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2011] [Accepted: 05/19/2011] [Indexed: 10/18/2022]
Abstract
The design, synthesis, and characterization of an unsymmetrical diamidato-dithiol ligand (H(4) 1, where the hydrogen atoms represent deprotonatable amide and thiol protons) and its cobalt(III) complex, a synthetic analogue of the cobalt-containing nitrile hydratase enzyme family, are reported. The ligand was prepared in 24% yield from an overall eight-step synthetic pathway following a modified protocol established in our laboratory that includes two peptide couples using O-(1H-benzotriazol-1-yl)-N,N,N',N'-tetramethyluronium hexafluorophosphate as the coupling agent. The ligand and all precursors were characterized by NMR spectroscopy and elemental analysis. The cobalt nitrile hydratase synthetic analogue complex [NBu(4)][Co(1)] was prepared on deprotonating ligand H(4) 1 to [1](4-) on addition of 5 equiv of NaH in N,N-dimethylformamide and adding 1 equiv of CoCl(2) at -40 °C under a N(2) atmosphere followed by oxidizing the complex by stirring it overnight open to dry air. The complex [NBu(4)][Co(1)] was isolated after counterion exchange with 1 equiv of NBu(4)Cl followed by crystallization from MeCN/Et(2)O in 71% yield. The structure of the complex was confirmed by X-ray diffraction analysis. Cyclic voltammetry studies on [NBu(4)][Co(1)] in a 0.1 M [NBu(4)][PF(6)]/MeCN solution showed a quasi-reversible reduction potential at -1.1 V (vs. Ag/AgCl), and magnetic susceptibility investigations indicated the complex is paramagnetic in both the solid and the solution states as determined from inverse-Gouy and Evans NMR methods, respectively.
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14
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Koutentis PA, Mirallai SI. Reinvestigating the synthesis of N-arylbenzamidines from benzonitriles and anilines in the presence of AlCl3. Tetrahedron 2010. [DOI: 10.1016/j.tet.2010.04.103] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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15
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Gao ML, Sun XL, Gu YF, Yao XL, Li CF, Bai JY, Wang C, Ma Z, Tang Y, Xie Z, Bu SZ, Qian C. Copolymerization of ethylene with cycloolefins by titanium complexes containing tridentate [o−NSR] ligands. ACTA ACUST UNITED AC 2008. [DOI: 10.1002/pola.22614] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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16
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Gao M, Wang C, Sun X, Qian C, Ma Z, Bu S, Tang Y, Xie Z. Ethylene-Norbornene Copolymerization by New Titanium Complexes Bearing Tridentate Ligands. Sidearm Effects on Catalytic Activity. Macromol Rapid Commun 2007. [DOI: 10.1002/marc.200700305] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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17
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Leitch AA, Oakley RT, Reed RW, Thompson LK. Electronic and Magnetic Interactions in π-Stacked Bisthiadiazinyl Radicals. Inorg Chem 2007; 46:6261-70. [PMID: 17625832 DOI: 10.1021/ic0700405] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The preparation of two bisthiadiazinyls (7, R1 = Me, Et; R2 = Cl, R3 = Ph), the first examples of a new class of resonance-stabilized heterocyclic thiazyl radical, are reported. Both radicals have been characterized in solution by EPR spectroscopy and cyclic voltammetry, which confirm highly delocalized spin distributions and low electrochemical cell potentials, features which augur well for the use of these materials as building blocks for neutral radical conductors. In the solid state, the radicals are undimerized, crystallizing in slipped pi-stack arrays which ensure the availability of electrons as potential charge carriers. However, despite these favorable electrochemical and structural properties, both materials exhibit low conductivities, with sigma(300K) < 10-7 S cm-1, a result which can be rationalized in terms of their EHT band electronic structures, which indicate that intermolecular interactions lateral to the pi-stacks are limited. The materials are thus very 1-D with low bandwidths, so that a Mott insulating state prevails. When R1 = Me, the intermolecular overlap along the pi-stacks is weak and the material is essentially paramagnetic. When R1 = Et, intermolecular pi-overlap is greater and variable-temperature magnetic susceptibility measurements indicate a strongly antiferromagnetically coupled system, the behavior of which has been modeled in terms of a molecular-field modified 1-D Heisenberg chain of S = 1/2 centers. Broken-symmetry DFT methods have been used to estimate the magnitude of individual exchange interactions within both structures.
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Affiliation(s)
- Alicea A Leitch
- Department of Chemistry, University of Waterloo, Waterloo, Ontario, Canada
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18
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Leitch AA, Reed RW, Robertson CM, Britten JF, Yu X, Secco RA, Oakley RT. An alternating pi-stacked bisdithiazolyl radical conductor. J Am Chem Soc 2007; 129:7903-14. [PMID: 17542584 DOI: 10.1021/ja071218p] [Citation(s) in RCA: 65] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A general synthetic route to the resonance-stabilized pyrazine-bridged bisdithiazolyl framework, involving the reductive deprotection of 2,6-diaminopyrazine-bisthiocyanate and cyclization with thionyl chloride, has been developed. An N-methyl bisdithiazolyl radical, 4-methyl-4H-bis[1,2,3]dithiazolo[4,5-b:5',4'-e]pyrazin-3-yl, has been prepared and characterized in solution by electron paramagnetic resonance spectroscopy and cyclic voltammetry. Its crystal structure has been determined at several temperatures. At 295 K, the structure belongs to the space group Cmca and consists of evenly spaced radicals pi-stacked in an alternating ABABAB fashion along the x-direction. At 123 K, the space group symmetry is lowered by loss of C-centering to Pccn, so that the radicals are no longer evenly spaced along the pi-stack. At 88 K, a further lowering of space group symmetry to P21/c is observed. Extended Hückel Theory band structure calculations indicate a progressive opening of a band gap at the Fermi level in the low-temperature structures. Magnetic susceptibility measurements over the range 4-300 K reveal essentially diamagnetic behavior below 120 K. Variable-temperature single-crystal conductivity (sigma) measurements indicate that the conductivity is activated, even at room temperature, with a room-temperature value sigma RT=0.001 S cm-1 and a thermal activation energy Eact=0.19 eV. Under an applied pressure of 5 GPa, sigma RT is increased by 3 orders of magnitude, but the conductivity remains activated, with Eact being lowered to 0.11 eV at 5.5 GPa.
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Affiliation(s)
- Alicea A Leitch
- Department of Chemistry, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada
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19
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Chekmarev DS, Shorshnev SV, Stepanov AE, Kasatkin AN. Highly selective substitutions in 2,3-dichloropyrazine. A novel general approach to aloisines. Tetrahedron 2006. [DOI: 10.1016/j.tet.2006.08.018] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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20
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Fryszkowska A, Tilford RW, Guo F, Kaszynski P. Activation of chlorine and fluorine by a phenylazo group towards nucleophilic aromatic substitution. Regioselective preparation of polysubstituted anilines. Tetrahedron 2005. [DOI: 10.1016/j.tet.2005.01.023] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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21
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New pi-delocalized persistent radicals. Molecules 2004; 9:716-24. [PMID: 18007472 DOI: 10.3390/90900716] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2004] [Accepted: 06/01/2004] [Indexed: 11/17/2022] Open
Abstract
Progress in the theoretical and experimental investigation of heterocyclic radicals suitable for incorporation into the structure of a liquid crystalline molecule is described. Five classes of heterocyclic systems are discussed, including their methods of preparation, stability and further functionalization to form potentially mesogenic materials.
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